HI Gummz,
my oven has a steel door surround and arch lintel, so there is not much movement. My door is made to go up against a vertical seal rather than fit snugly within the door opening void. A picture of your oven entrance would help solve or reduce your problem.

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I experienced the same effect with my first oven. I made a tapered wooden door which I cast over with cartable refractory so the fit was pretty tight. If I left the door in place overnight it was difficult to remove because the refractory had expanded significantly on heating and then shrunk tight around it on cooling. I learnt to pull the door out a tiny bit before leaving it overnight. I think the door is better if it sits in front of the arch rather than in it for the above reason.

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